Omega PX548 User Manual

User’s Guide

PX548

Wet/Wet Differential

Pressure Sensor

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WARNING: These products are not designed for use in, and should not be used for,
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M-3295/0300

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship
for a period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one
(1) month grace period to the normal one (1) year product warranty to cover handling and
shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product.
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer
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written request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired
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outside of design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if
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following information available BEFORE
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product was PURCHASED,

2. Model and serial number of the product under
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relative to the product.

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RETURN REQUESTS/INQUIRIES

FOR NON-WARRANTY REPAIRS, consult
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Adjustments

The following equipment is required to carry out the adjustments:
r Power supply
r Voltmeter or
r Milli-ammeter
r Pressure standard

uConnect the sensor as shown in Installation. The sensor should be put in its normal

operating position (vertical or horizontal). Remove the cover to gain access to the
zero and span adjustment potentiometers.

Zero adjustment

uDepending on the model, set the zero adjustment to: 0.00 V, 4.00 mA or 12.00 mA.
uSpan adjustment is carried out with the required span pressure applied to the +

uDepending on the model, set the span adjustment to: 5.00 V, 1 0.00 V or 20.00 mA.
uRelease the pressure.

Completion

Check the output at z ero pressure and if necessary, repeat the zero and span
adjustments.

r Release the pressure and disconnect the equipment.

r Refit the cover.

Specification

Pressure range:......................................................................0 to ±0.2 inH2O - 0 to ±150 psid

Pressure media:

All fluids, gases and vapors compatible with anodized A U4G, beryllium copper , tin and
brazing solder and Loctite Master Joint 51 0

Accuracy:............................................................................................................ ±0.25% FS BSL

(including linearity, h ysteresis and repeatability)

Long term stability:............................................................................±0.3% over 12 months

Weight (appro ximate)...........................................................................................................2.1lbs

Dimensions......................................................................................................................see below

Electrical Specification

Power supply

LPX 5000.............................................1 0 to 30 V d.c.

LPM 5000............................................18 to 30 V d.c.

LPM 5000 (±5 V d.c. output)............±12 V d.c.

G1/8 F via
welded
adapter

OMEGA’s policy is to make running changes, not model changes, whenever an improve­ment is possible. This affords our customers the latest in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC. © Copyright 1999
OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied,
photocopied, reproduced, translated, or reduced to any electronic medium or machine­readable form, in whole or in part, without the prior written consent of OMEGA
ENGINEERING, INC.

Dimensions

Installation

CAUTION:

1. INCORRECT ELECTRICAL CONNECTIONS CAN, IN CERTAIN CIRCUMSTANCES, DESTROY THE

ELECTRONIC

2. BEFORE APPLYING ELECTRICAL PO WER, MAKE SURE THE SUPPLY VOL T AGE IS TO THE CORRECT

RATING

3. THIS A VERY SENSITIVE SENSOR, ONLY APPLY PRESSURE WITHIN THE PRESSURE RANGE.
Mounting

T wo M5 threaded holes in the base of the sensor provide mounting points.

OUTPUT CIRCUIT.

.

Note: The screws must not enter the holes more than 0.4" into the sensor body.

The installed position of the sensor should be away from sudden temperature
variations, shocks and vibrations and should not be close to strong electromagnetic
fields (transformers, motors etc.). The sensor can be mounted in any position, but
mounting at an angle may require zero adjustment. For very low pressure sensors
(less than 2.0 inH2O) the recommended mounting is horizontal.

zero adjustment
(fine)

span adjustment

zero adjustment
(coarse)

square root output
selection switch
(optional)

filter time response
selector switch

terminal connector
block

gland nut
(cable entry)

Internal detail

Electromagnetic Interference

To avoid electrical interference, use shielded cable with the shield connected to the
earth ground at both ends. The ground of the sensor can be the casing or the ground
terminal screw.

Electrical connections

PX548 Series (current output)

The maximum allowable load resistance is

calculated to formula:

pressure connector

PX548 Series (Unidirectional voltage output)

Minimum load 2 k

W

Note: Connections 5 and 6 are common

If the output cable passes through an area of electrical disturbance, use a
recommended load impedance of between 2 kW and 10 kW. Connect the load
resistance between the wires corresponding to signal and - terminal at a point
furthest from the sensor .

PX548 Series bidirectional operation using bipolar
power supply (±1 2 Vdc) with bidirectional output
(0±5 Vdc or 0±2.5 Vdc)

Connect the power supply to + for positive, - for negative,
and 0 for neutral; connect the output to signal for positive
and 0 for negative signal.

Minimum load 1 k

Pressure connections

The high pressure connector is marked
Purging or de-gasing the sensor
T wo 5 mm hexagonal socket bleed screws are located on the outer casing and can be

loosened to bleed the two pressure connectors. Make sure that these screws are
tightened after this operation.

+

and the low pressure connector is marked

W

–.

Note: It is possible to changeo ver the bleed screws and pressure connectors

enabling easier access or permitting installation in a difficult position.

Square root output option

This option only applies to the LPX 5000 sensor with 4 to 20 mA two wire connection
and the square root electronics assembly fitted. A switc h next to the terminal bloc k
selects the output mode.

Switch Output mode

OFF Linear
ON Square root

Filter response time

The filter response time of the sensor, additional to the built-in response time of 1 0
milliseconds (approximately), can be set using the three switc hes next to the
terminal connector. Using combinations of the switc hes can set dif ferent times.

R Max = 0.05 (V supply - 10) kW

Where: R Max in kW and V in Volts

Switch Filter response time

A 200 milliseconds
B 400 milliseconds

C 1 second

Example:
Switch A+B = 600 milliseconds

Note: A hollow point is visible when a switch is in the 'on' position.